After merging your PR, Conbench analyzed the 6 benchmarking runs that have been run so far on merge-commit 66d948d.

Benchmarks with performance regressions

There were 2 possible performance regressions, according to the lookback z-score method.

Benchmarks with regressions:

• Commit Run on ursa-i9-9960x at 2023-09-01 16:47:39Z
  • dataframe-to-table (R) with dataset=type_floats, language=R
  • tpch (R) with engine=arrow, format=parquet, language=R, memory_map=False, query_id=TPCH-08, scale_factor=1

All benchmark runs analyzed:

• Commit Run on ec2-t3-xlarge-us-east-2 at 2023-08-31 23:25:50Z
• Commit Run on ec2-m5-4xlarge-us-east-2 at 2023-09-01 01:12:08Z
• Commit Run on arm64-t4g-linux-compute at 2023-09-01 01:25:20Z
• Commit Run on ursa-i9-9960x at 2023-09-01 16:47:39Z
• Commit Run on arm64-m6g-linux-compute at 2023-09-01 19:13:45Z
• Commit Run on ursa-thinkcentre-m75q at 2023-09-03 15:13:55Z

Unstable benchmarks with performance regressions

The following benchmark results indicate a possible performance regression, but are known to sometimes produce false positives when applying the lookback z-score analysis.

• Commit Run on arm64-t4g-linux-compute at 2023-09-01 01:25:20Z

  • BM_ReadColumn (C++) with params=<false,BooleanType>/1/20, source=cpp-micro, suite=parquet-arrow-reader-writer-benchmark

• Commit Run on arm64-m6g-linux-compute at 2023-09-01 19:13:45Z

  • BM_ReadColumn (C++) with params=<false,BooleanType>/1/20, source=cpp-micro, suite=parquet-arrow-reader-writer-benchmark
  • BM_WriteColumn (C++) with params=<false,BooleanType>, source=cpp-micro, suite=parquet-arrow-reader-writer-benchmark

• Commit Run on ursa-thinkcentre-m75q at 2023-09-03 15:13:55Z

  • BM_ByteStreamSplitDecode_Float_Scalar (C++) with params=32768, source=cpp-micro, suite=parquet-encoding-benchmark
  • BM_ByteStreamSplitEncode_Float_Sse2 (C++) with params=32768, source=cpp-micro, suite=parquet-encoding-benchmark
  • BM_ByteStreamSplitDecode_Float_Scalar (C++) with params=65536, source=cpp-micro, suite=parquet-encoding-benchmark
  • BM_ReadColumn (C++) with params=<true,BooleanType>/5/10, source=cpp-micro, suite=parquet-arrow-reader-writer-benchmark
  • BM_ByteStreamSplitDecode_Float_Scalar (C++) with params=1024, source=cpp-micro, suite=parquet-encoding-benchmark
  • BM_ByteStreamSplitDecode_Float_Scalar (C++) with params=4096, source=cpp-micro, suite=parquet-encoding-benchmark